I didn't date much until college.
My advice is to consider High School practice in terms of the dating scene - but not really the real thing.
On rare occasion people in high school meet the love of their life - but don't plan on that.

I would try to do as well as you can in school, including finding extracurricular things you enjoy doing - so that when the time comes, you can go to college where you will meet lots of interesting attractive women who are not so immature as to judge a man by his height.